I already posted this week once about space toggles, but today I did use a variation of the technique, where it is not strictly space toggles, but something like space placeholders. The idea is: sometimes we want to make some properties extensible, which can be very useful for properties that do not have longhands, or for properties which can accept an unlimited number of values. CSS variables can be very helpful for coming up with your API, which allows controlling these prope...
